Friction-driving drum

ABSTRACT

The cam used in quick traverse type winders has one or more turns of spiral grooves that run in opposite directions and cross one another at one or more points on opposite edges of a diametral plane. This cam is also a friction-driving drum for rotating a core or package on which a strand is being wound. These drums are molded from a thermosetting material such as Bakelite or Formica. For winding fine yarns spaced apart, axially extending grooves are provided about the periphery of the drum.

United States Patent [72] Inventor Julian B. Chavis P.0. Box 939, Gastonia, N.C. 28052 [21 1 Appl. No. 732,590 [22] Filed May 28, 1968 [45] Patented Mar. 30, 1971 [54] FRICTION-DRIVING DRUM 5 Claims, 2 Drawing Figs.

[52] US. Cl 242/431 [51] Int. Cl B65h 54/48 [50] Field of Search 242/432,

[56] References Cited UNITED STATES PATENTS 2,739,761 3/1956 Haefeli 242/432 l 13,572,s9s

2,998,203 8/1961 Pitts 242/432 3,128,957 4/1964 Fallscheer 242/432 FOREIGN PATENTS 992,268 5/1965 Great Britain 242/432 Primary ExaminerStan1ey N. Gilreath An0rneyEdwin E. Greigg ABSTRACT: The cam used in quick traverse type winders has one or more turns of spiral grooves that run in opposite directions and cross one another at one or more points on opposite edges of a diametral plane. This cam is also a frictiondriving drum for rotating a core or package on which a strand is being wound. These drums are molded from a thermosetting material such as Bakelite or Formica. For winding fine yarns spaced apart, axially extending grooves are provided about the periphery of the drum.

Patented March 30, 1971 I I 3,572,598

NVE R' svg I AT RNEY 1 FRICTION DRIVING DRUM This invention relates to improvements in the drum cam used in certain quick traverse winding machines. It is customary in such devices to provide the surface of the drum with oppositely directed spiral grooves which lay funicular material in spiral turns on a core or package which is rotated by frictional contact with the surface of the drum.

An object of this invention is to provide a traverse drum for winding funicular material such as filaments of very low deni- Another object of this invention is the provision of a traverse drum formed of a thermosetting resin having spaced apart, axially extending grooves in its periphery.

A further object of this invention is the provision of a traverse drum of therrnosetting material having axially extending peripheral grooves spaced parallel about the periphery thereof.

'Other objects and advantages will become readily apparent from a following study of the specification and drawings in which:

FIG. 1 is an elevation of a portion of a winding machine featuring the traverse drum and associated parts; and

FIG. 2 is a section on the line 2-2 of FIG. 1.

In FIG. 1, the numeral indicates portions of a winding machine frame, including standards 11 having bearings 12 for rotatably supporting the shaft 13 which has an extension 14 at one end for connection to suitable drive means. In order to show the relation of the drum to other-parts of the machine, portions of the stop-motion means 15 are shown, as also are portions of the resetting device 16, since both these devices are known broadly and are claimed specifically in my copending application Ser. No. 665,799, filed Sept. 6, 1967, and since these form no part of the present invention, further description is deemed unnecessary. Numeral l7 denotes a portion of a yoke carrying a shaft 18, rotatably supporting a core 19 on which a package 20 of yarn or filament is to be wound. The core 19 and package 20 are caused to bear against the traverse drum 21 and to move, under pressure, therefrom as the package 20 builds up. It may be mentioned here that though a conical package is to be made, with no modification except for a cylindrical core in lieu of the'core 19, a cylindrical package also may be wound.

The drum 21 comprises a cylinder having a length of at least as great as the length of the package. As here shown, it is somewhat longer than the package and has reversely directed spiral grooves 22, 23 formed in its surface. These grooves cross at opposite sides of a diametral plane as at 24, 25 and reverse at their ends as at 26, 27. Funicular material, such as a strand, yarn or filament, travels in the grooves 22, 23 and is spirally wound on the core 19 and on the package 20.

It has been found that certain materials, particularly very fine or very low denier yarns or filaments, are not always picked up by the grooves 22, 23. The terminology picked up" is used to express a condition of the travel of a low denier yarn during its traversing the cam slots provided in a conventional drum. To properly prepare a package on a winding machine, the yarn must be picked up" in the cam slot and retained therein until the package is fully wound. lnvariably in a conventional cam slotted drum construction the yarn is not picked up" properly at the outset of the winding operation and merely beings to bunch up on the cone adjacent to one end of the drum. Also, during the winding operation even though the low denier yarn may traverse the length of a conventional winding drum once or twice it always jumps from the cam slot thus necessitating stopping of the winding machine, reinserting the yarn in the slot and then restarting the machine. Naturally, it is desirable to build a uniformly wound package on a winding machine with greater facility than this, but this was practically impossible until the present invention. Knurling has been tried on metal cams in an effortto improve the operation of the drum, but has been found not to be satisfactory since it damages extremely very low denier yarn. After much experimentjn I have found that circumerentrally spaced parallel, axia y extending grooves 28 glve the best results so far obtainable. These grooves 28 occupy the peripheral space between the spiral grooves 22, 23, but do not intersect such grooves, and are substantially semicircular in cross section.

The best results have been achieved, particularly with the winding of very low denier yarn, by providing approximately seven-sixteenths of an inch spacing between the grooves 28 at their point of intersection with the periphery of the drum.

Although only one embodiment of the invention has been depicted and described, it will be apparent that this embodiment is illustrative in nature and that a number of modifications in the apparatus and variations in its end use may be effected without departing from the spirit or scope of the invention as defined in the appended claims.

lclaim:

1. In a quick traverse winding machine of the type having a cylindrical friction-driving traverse drum of a thermosetting resin including end walls and having at least two reversely directed spirally arranged intersecting traversing grooves, the improvement including parallel circumferentially spaced grooves in the peripheral surface thereof, said circumferentially spaced grooves occupying the space between the two reversely directed spirally arranged intersecting grooves and extending parallel to the axis of the drum.

2. The device according to claim I, wherein the spaced parallel grooves are substantially semicircular in cross section.

31. The device according to claim I, wherein the circumferentially spaced grooves occupy the major portion of the space lying between the intersecting grooves and the end walls of said drum.

t. The device according to claim I, wherein the parallel cir cumferentially spaced grooves are spaced apart seven-sixteenths of an inch.

5. The device according to claim 4, wherein the parallel circumferentially spaced grooves are semicircular in cross section. a 

1. In a quick traverse winding machine of the type having a cylindrical friction-driving traverse drum of a thermosetting resin including end walls and having at least two reversely directed spirally arranged intersecting traversing grooves, the improvement including parallel circumferentially spaced grooves in the peripheral surface thereof, said circumferentially spaced grooves occupying the space between the two reversely directed spirally arranged intersecting grooves and extending parallel to the axis of the drum.
 2. The device according to claim 1, wherein the spaced parallel grooves are substantially semicircular in cross section.
 3. The device according to claim 1, wherein the circumferentially spaced grooves occupy the major portion of the space lying between the intersecting grooves and the end walls of said drum.
 4. The device according to claim 1, wherein the parallel circumferentially spaced grooves are spaced apart seven-sixteenths of an inch.
 5. The device according to claim 4, wherein the parallel circumferentially spaced grooves are semicircular in cross section. 